Note: The aldehydes are intermediatebetween the alcohols and
acids, and differ from the alcohols in having two less
hydrogen atoms in the molecule, as common aldehyde
(called also {acetaldehyde}, {acetic aldehyde} or
{ethyl aldehyde}), {C2H4O}; methyl aldehyde (called
also {formaldehyde}), {CH2O}.
[1913 Webster +PJC]

{Aldehyde ammonia} (Chem.), a compound formed by the union of
aldehyde with ammonia.
[1913 Webster]

aldehyde — (n.) first oxidation product of alcohol, 1833, discovered in 1774 by German born Swedish chemist Carl Wilhelm Scheele (1742 1786), the name said to have been coined by German chemist Justus von Liebig (1803 1873) from abbreviation of Modern Latin … Etymology dictionary

aldehyde — ► NOUN Chemistry ▪ an organic compound containing the group CHO, formed by the oxidation of alcohols. ORIGIN from Latin alcohol dehydrogenatum alcohol deprived of hydrogen … English terms dictionary